Method for repairing and processing bearing hole of main bearing cap of diesel engine body of diesel locomotive

A main bearing cap and main bearing technology is applied in the field of maintenance and processing of main bearing holes of the main bearing cap of the diesel engine body of a diesel locomotive, which can solve the problems of high operation technical requirements, long production cycle, high labor intensity, etc. Quality improvement, wide application effect

Active Publication Date: 2010-03-03
CNR LANZHOU LOCOMOTIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] During the overhaul of the diesel locomotive diesel engine body, due to the deformation and burning of the main bearing cap of the body during the operation of the diesel engine, or due to inappropriate repair methods, the coaxiality and hole diameter of the main bearing hole of the body exceed the limit, and the surface accuracy of the main bearing hole suffers. to damage, to form defects
Generally, the coaxiality of the main bearing hole of the diesel engine body of a diesel locomotive is very high (according to the overhaul regulations of the diesel locomotive and user requirements, the deviation of the main bearing hole of each gear relative to the common axis of the 1st and 9th main bearing holes, the total length ≯φ0.10mm , adjacent≯φ0.06mm), the existing repair method is to replace the semi-finished main bearing cap, and use a large precision boring machine to perform secondary processing on the main bearing hole of the body to restore its coaxiality, aperture and surface roughness. The cost of the repair method is high, the production cycle is long, and the repair price is as high as tens of thousands of yuan; the other method is that the repair shop adopts the methods of brush plating, filing and grinding to repair the main bearing hole of the machine body in order to save costs. The labor intensity of the method is high, the production cycle is long, the yield of finished products is low, the technical requirements for the maintenance personnel are high, the labor intensity is high, and the quality of maintenance is difficult to guarantee, resulting in many quality accidents

Method used

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  • Method for repairing and processing bearing hole of main bearing cap of diesel engine body of diesel locomotive
  • Method for repairing and processing bearing hole of main bearing cap of diesel engine body of diesel locomotive

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Embodiment 1

[0032] Method 1: Machining the bearing hole of the original main bearing cap of the diesel engine body:

[0033] like figure 1 As shown, on the level 1 platform, with the same side of the main bearing cap 2 (such as the left side) as the reference, two groups of main bearing caps (2, 3) with defective main bearing holes are placed vertically, facing each other to form a For a complete cylindrical hole, use two fastening bolts (1) to fasten it, use a feeler gauge under the surface A to adjust the diameter b″-b″, c″-c″ in the direction of the minor axis, so that the diameter b″- The difference between b″, c″-c″ is not more than 0.02mm, measure the diameter a″-a″ in the direction of the major axis, record it as A1, remove the fastening bolt (1); measure the two main bearing caps (2, 3) in pairs Relative to the long and short axis diameters of the holes formed after assembly; the main bearing cap 2 (such as figure 2 ) is placed on the vertical milling machine, supported by two ...

Embodiment 2

[0038] Method 2: Replace the original main bearing cap with a semi-finished main bearing cap after processing.

[0039] Assemble the original main bearing cap according to method 1, step a, measure and record the A1 value and then disassemble; pre-install the semi-finished main bearing cap on the machine body, and measure the eccentricity between the bearing hole of the semi-finished main bearing cap and the bearing hole of the frame , assemble the two main bearing caps; according to method 1, step d, install the clamp, align and fix the workpiece on the boring machine, compare the values ​​of B3 and C3, if B3 Figure 4 ), the offset is calculated as follows;

[0040] O-O'=(B3-C3)÷2

[0041] The center of the main shaft of the machine tool and the center of the bearing hole of the semi-finished main bearing cover are offset according to the pre-measured eccentricity, and are processed and assembled according to the method described in claim 2 to restore the coaxiality and apert...

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Abstract

The invention discloses a method for repairing and processing a main bearing cap of a diesel engine body of a diesel locomotive, which comprises a method for realizing the repairing and processing of a bearing hole of an original main bearing cap of a diesel engine body by a common boring mill and a repairing and processing method which uses a semi-manufactured main bearing cap to replace the bearing hole of the original main bearing cap. When the method is applied to the repairing and processing operation of the diesel locomotive, the diesel engine body and the main bearing cap are separated, the bearing hole of the main bearing cap is separately processed by means of accurate measurement and reasonable processing technology, the processing of the bearing hole is completed by the common boring mill instead of large-scale equipment, so the current situation that the main bearing cap can be processed by large-scale equipment only after being assembled with the engine body in the past is changed, the quality of repairing and processing is improved fundamentally, the work efficiency is high, the cost is low and the scope of application is wide, thereby realizing the purpose of repairing the main bearing hole of the large-scale engine body by the common machine tool. The invention has the repairing cost which is only 3 percent of the processing cost of the large-scale machine tool, thereby having considerable economic benefit.

Description

technical field [0001] The invention belongs to a method for overhauling and processing the main bearing hole of the main bearing cap of the diesel engine body of a railway diesel locomotive. Background technique [0002] During the overhaul of the diesel locomotive diesel engine body, due to the deformation and burning of the main bearing cover of the diesel engine during the operation of the diesel engine, or due to improper repair methods, the coaxiality and hole diameter of the main bearing hole of the body exceed the limit, and the surface accuracy of the main bearing hole suffers. to damage and form defects. Usually, the coaxiality of the main bearing hole of diesel locomotive diesel engine body is very high (according to the diesel locomotive overhaul regulations and user requirements, the deviation of the main bearing hole of each gear relative to the common axis of the 1st and 9th main bearing holes, the total length ≯φ0.10mm , adjacent≯φ0.06mm), the existing repai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/00
Inventor 徐世武马玉临
Owner CNR LANZHOU LOCOMOTIVE
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